Low-Profile Dual-Band Shared-Aperture Base Station Antennas Based on FSS Radiators

In this letter, a low-profile dual-band dual-polarized base station antenna system is proposed for 5G applications. Distinct from previous base station antennas using FSS as a decoupling layer, the frequency selective surface (FSS) structure is employed directly as the low-band (LB) antenna at 0.69–0.96 GHz. At the same time, the FSS operates as the reflector for the high-band (HB) antennas at 3.3–3.8 GHz. Hence, the radiation patterns of both the HB and the LB antennas are restored to match the patterns of the isolated antennas. Stable radiation and high boresight gains are achieved over the operating bands. The antennas are fabricated and measured, with the measurement results agreeing well with the simulated ones. The proposed antenna array is suitable for base stations with large-scale arrays due to its simple structure, low profile and stable radiation features.